Hi Marcel, there are a few ways to say that
The most common is "de rien"
Another one, more formal, would be "je t'en prie" or "je vous en prie"
You could even say "pas de soucis" like "no problem"
and a last one for now that is much more informal, we sometimes say "t'inquiète" which is the diminutive of "ne t'inquiète pas" so in English it would be "don"t worry" or "no worries"
Thanks a lot Marvin for explaining how to say welcome in French. I didn't know all the phrases and I learnt something new today 😀
Any chance for adding pronunciation of these few phrases? By the way, what would be Welcome when you greet somebody in French?